1 /*- 2 * Copyright 1996-1998 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/exec.h> 33 #include <sys/imgact.h> 34 #include <sys/linker.h> 35 #include <sys/proc.h> 36 #include <sys/sysent.h> 37 #include <sys/imgact_elf.h> 38 #include <sys/syscall.h> 39 #include <sys/signalvar.h> 40 #include <sys/vnode.h> 41 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 #include <vm/vm_param.h> 45 46 #include <machine/elf.h> 47 #include <machine/fpu.h> 48 #include <machine/md_var.h> 49 50 struct sysentvec elf64_freebsd_sysvec = { 51 .sv_size = SYS_MAXSYSCALL, 52 .sv_table = sysent, 53 .sv_mask = 0, 54 .sv_errsize = 0, 55 .sv_errtbl = NULL, 56 .sv_transtrap = NULL, 57 .sv_fixup = __elfN(freebsd_fixup), 58 .sv_sendsig = sendsig, 59 .sv_sigcode = sigcode, 60 .sv_szsigcode = &szsigcode, 61 .sv_name = "FreeBSD ELF64", 62 .sv_coredump = __elfN(coredump), 63 .sv_imgact_try = NULL, 64 .sv_minsigstksz = MINSIGSTKSZ, 65 .sv_pagesize = PAGE_SIZE, 66 .sv_minuser = VM_MIN_ADDRESS, 67 .sv_maxuser = VM_MAXUSER_ADDRESS, 68 .sv_usrstack = USRSTACK, 69 .sv_psstrings = PS_STRINGS, 70 .sv_stackprot = VM_PROT_ALL, 71 .sv_copyout_strings = exec_copyout_strings, 72 .sv_setregs = exec_setregs, 73 .sv_fixlimit = NULL, 74 .sv_maxssiz = NULL, 75 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP, 76 .sv_set_syscall_retval = cpu_set_syscall_retval, 77 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 78 .sv_syscallnames = syscallnames, 79 .sv_shared_page_base = SHAREDPAGE, 80 .sv_shared_page_len = PAGE_SIZE, 81 .sv_schedtail = NULL, 82 .sv_thread_detach = NULL, 83 .sv_trap = NULL, 84 }; 85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 86 87 static Elf64_Brandinfo freebsd_brand_info = { 88 .brand = ELFOSABI_FREEBSD, 89 .machine = EM_X86_64, 90 .compat_3_brand = "FreeBSD", 91 .emul_path = NULL, 92 .interp_path = "/libexec/ld-elf.so.1", 93 .sysvec = &elf64_freebsd_sysvec, 94 .interp_newpath = NULL, 95 .brand_note = &elf64_freebsd_brandnote, 96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 97 }; 98 99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 100 (sysinit_cfunc_t) elf64_insert_brand_entry, 101 &freebsd_brand_info); 102 103 static Elf64_Brandinfo freebsd_brand_oinfo = { 104 .brand = ELFOSABI_FREEBSD, 105 .machine = EM_X86_64, 106 .compat_3_brand = "FreeBSD", 107 .emul_path = NULL, 108 .interp_path = "/usr/libexec/ld-elf.so.1", 109 .sysvec = &elf64_freebsd_sysvec, 110 .interp_newpath = NULL, 111 .brand_note = &elf64_freebsd_brandnote, 112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 113 }; 114 115 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 116 (sysinit_cfunc_t) elf64_insert_brand_entry, 117 &freebsd_brand_oinfo); 118 119 static Elf64_Brandinfo kfreebsd_brand_info = { 120 .brand = ELFOSABI_FREEBSD, 121 .machine = EM_X86_64, 122 .compat_3_brand = "FreeBSD", 123 .emul_path = NULL, 124 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 125 .sysvec = &elf64_freebsd_sysvec, 126 .interp_newpath = NULL, 127 .brand_note = &elf64_kfreebsd_brandnote, 128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 129 }; 130 131 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 132 (sysinit_cfunc_t) elf64_insert_brand_entry, 133 &kfreebsd_brand_info); 134 135 void 136 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 137 { 138 void *buf; 139 size_t len; 140 141 len = 0; 142 if (use_xsave) { 143 if (dst != NULL) { 144 fpugetregs(td); 145 len += elf64_populate_note(NT_X86_XSTATE, 146 get_pcb_user_save_td(td), dst, 147 cpu_max_ext_state_size, &buf); 148 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 149 xsave_mask; 150 } else 151 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL, 152 cpu_max_ext_state_size, NULL); 153 } 154 *off = len; 155 } 156 157 /* Process one elf relocation with addend. */ 158 static int 159 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 160 int type, int local, elf_lookup_fn lookup) 161 { 162 Elf64_Addr *where, val; 163 Elf32_Addr *where32, val32; 164 Elf_Addr addr; 165 Elf_Addr addend; 166 Elf_Size rtype, symidx; 167 const Elf_Rel *rel; 168 const Elf_Rela *rela; 169 int error; 170 171 switch (type) { 172 case ELF_RELOC_REL: 173 rel = (const Elf_Rel *)data; 174 where = (Elf_Addr *) (relocbase + rel->r_offset); 175 rtype = ELF_R_TYPE(rel->r_info); 176 symidx = ELF_R_SYM(rel->r_info); 177 /* Addend is 32 bit on 32 bit relocs */ 178 switch (rtype) { 179 case R_X86_64_PC32: 180 case R_X86_64_32S: 181 case R_X86_64_PLT32: 182 addend = *(Elf32_Addr *)where; 183 break; 184 default: 185 addend = *where; 186 break; 187 } 188 break; 189 case ELF_RELOC_RELA: 190 rela = (const Elf_Rela *)data; 191 where = (Elf_Addr *) (relocbase + rela->r_offset); 192 addend = rela->r_addend; 193 rtype = ELF_R_TYPE(rela->r_info); 194 symidx = ELF_R_SYM(rela->r_info); 195 break; 196 default: 197 panic("unknown reloc type %d\n", type); 198 } 199 200 switch (rtype) { 201 202 case R_X86_64_NONE: /* none */ 203 break; 204 205 case R_X86_64_64: /* S + A */ 206 error = lookup(lf, symidx, 1, &addr); 207 val = addr + addend; 208 if (error != 0) 209 return -1; 210 if (*where != val) 211 *where = val; 212 break; 213 214 case R_X86_64_PC32: /* S + A - P */ 215 case R_X86_64_PLT32: /* L + A - P, L is PLT location for 216 the symbol, which we treat as S */ 217 error = lookup(lf, symidx, 1, &addr); 218 where32 = (Elf32_Addr *)where; 219 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 220 if (error != 0) 221 return -1; 222 if (*where32 != val32) 223 *where32 = val32; 224 break; 225 226 case R_X86_64_32S: /* S + A sign extend */ 227 error = lookup(lf, symidx, 1, &addr); 228 val32 = (Elf32_Addr)(addr + addend); 229 where32 = (Elf32_Addr *)where; 230 if (error != 0) 231 return -1; 232 if (*where32 != val32) 233 *where32 = val32; 234 break; 235 236 case R_X86_64_COPY: /* none */ 237 /* 238 * There shouldn't be copy relocations in kernel 239 * objects. 240 */ 241 printf("kldload: unexpected R_COPY relocation\n"); 242 return -1; 243 break; 244 245 case R_X86_64_GLOB_DAT: /* S */ 246 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 247 error = lookup(lf, symidx, 1, &addr); 248 if (error != 0) 249 return -1; 250 if (*where != addr) 251 *where = addr; 252 break; 253 254 case R_X86_64_RELATIVE: /* B + A */ 255 addr = relocbase + addend; 256 val = addr; 257 if (*where != val) 258 *where = val; 259 break; 260 261 default: 262 printf("kldload: unexpected relocation type %ld\n", 263 rtype); 264 return -1; 265 } 266 return(0); 267 } 268 269 int 270 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 271 elf_lookup_fn lookup) 272 { 273 274 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 275 } 276 277 int 278 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 279 int type, elf_lookup_fn lookup) 280 { 281 282 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 283 } 284 285 int 286 elf_cpu_load_file(linker_file_t lf __unused) 287 { 288 289 return (0); 290 } 291 292 int 293 elf_cpu_unload_file(linker_file_t lf __unused) 294 { 295 296 return (0); 297 } 298